/**
  * My {@link KeyedPoolableObjectFactory} method for passivating {@link PreparedStatement}s.
  * Currently invokes {@link PreparedStatement#clearParameters}.
  *
  * @param key ignored
  * @param obj a {@link PreparedStatement}
  */
 public void passivateObject(Object key, Object obj) throws Exception {
   ((PreparedStatement) obj).clearParameters();
   ((DelegatingPreparedStatement) obj).passivate();
 }